Ichthyophthirius

Ichthyophthirius

 

a genus of protozoa of the order Holotricha comprising the one species {Ichthyophthirius multifil-iis). It parasitizes fish that live in fresh and slightly saline waters, under the epithelium of the skin and gills, under the cornea of the eye, and often the fins; it produces whitish swellings of the skin—pustules. At 28°C the growth of Ichthyophthirius in the fish lasts about one day and at 20°C, seven days. Mature infusori-ans (up to 1 mm in size)—trophonts—emerge from the pustules into the water and, upon falling to the bottom of the water, become encysted. In the cyst, division occurs eight to 12 times and 500 to 1,000 (sometimes up to 2, 000) tiny forms (20–microns in diameter) develop, which are covered with cilia. Known as tomites, these forms emerge from the cyst into thewater and infect other fish. Ichthyophthirius often cause massdestruction of fish, particularly of fry. Their control is effectedwith chemical agents.

References in periodicals archive ?
(2002) evaluating Nile tilapia from a fishery located in southeastern Brazil have observed that the parasitism by Ichthyophthirius multifiliis Fouquet, 1876 (Protozoa: Ciliophora) and Saprolegnia sp.
An assessment of the use of drug and non-drug interventions in the treatment of Ichthyophthirius multifiliis Fouquet, 1876, a protozoan parasite of freshwater fish.
Ich, short for Ichthyophthirius multifiliis, is a nasty parasite that kills various freshwater fishes worldwide, resulting in severe losses to both food and ornamental fish.
Ichthyophthiriasis, usually referred to as "ich" or "fish whitespot", is a serious disease caused by the ciliate protozoan parasite Ichthyophthirius multifiliis (Fouquet, 1876), which exists worldwide and may infect all freshwater fish (SUDOVA et al., 2010), with great financial impact on the culture of fish for human consumption and in aquariums due to high mortality rates typically associated with the disease.
nuchalis examined had 19.9 [+ or -] 1.6 cm and 41.4 [+ or -] 11.6 g, and all were parasitized by species of protozoans and/or metazoans, such as Ichthyophthirius multifiliis Fouquet, 1876; Piscinoodinium pilullare Schaperclaus, 1954, Lom, 1981 (Protozoa); Cosmetocleithrum striatuli Abdallah, Azevedo and Luque, 2012 (Monogenoidea), Procamallanus (Spirocamallanus) inopinatus Travassos, Artigas and Pereira, 1928 (Nematoda) and metacercariae of Posthodiplostomum sp.
Klesius, "Evaluation of an antiparasitic compound extracted from Galla chinensis against fish parasite Ichthyophthirius multifiliis," Veterinary Parasitology, vol.
[13.] Straus DL, Hossain MM and TG Clark Copper sulfate toxicity to two isolates of Ichthyophthirius multifilisi relative to alkalinity.
Efeito da suplementagao de vitamina C na dieta sobre a susceptibilidade de alevinos de jundia, Rhamdia quelen, ao Ichthyophthirius multifiliis.
Antiparasitic effect of cynatratoside-C from Cynanchum atratum against Ichthyophthirius multifiliis on grass carp.
Generation and analysis of expressed sequence tags from the ciliate protozoan parasite Ichthyophthirius multifiliis.